help with applications of vector addition

I can't seem to draw this diagram.
A sign weighing 98N is suspended from the middle of a 4m long chain. The ends of the chain are attached to a ceiling at points 3m apart. Okay so i drew a diagram with a horizontal that is 3m and the chain hanging from each side is 2m long and the object is 98N. I'm not sure if its right because I'm not getting the answer that the textbook gives. And the question is to determine the tensions in the chains.
Your help is greatly appreciated.